68CHAPTER 5: GATEWAY CONFIGURATION

To use access control for all computers:

1Click PCs access authorized services only.

2Select All PCs to setup the access rights for all computers connected to the Gateway.

3Select authorized services by clicking in the appropriate check box(es) (Figure 52).

Figure 52 All PCs Setup Screen

In addition to the four authorized services listed, you can choose to allow or block access to other services. You can either:

Allow all other services with exceptions, or

Block all other services with exceptions

4To do this, select Allow or Block from the drop down menu and enter the exceptions into the text box.

The port numbers are specified using a comma-separated list, with hyphens to denote port number ranges. So for example, entering 2, 3, 5-7would cause ports 2, 3, 5, 6, and 7 to be activated.

For example, to block access to all services except Web (80) and a service that uses ports 2,3,5,6 and 7:

1.Tick the Web(80) check box.

2.Select ‘Block’ all other services.

3.Enter ‘2, 3, 5-7’ in the ‘except (specify ports) box. See Figure 53.

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3Com 3CRWE554G72 manual Click PCs access authorized services only